Improvements to thick film elements

Details Improvements to thick film elements Improvements to thick film elements

H - Electricity

05

B

H05B 3/18 (2006.01) H05B 1/02 (2006.01) H05B 3/26 (2006.01) H05B 3/74 (2006.01)

Patent

CA 2204600

A thick film resistive heating element (1) comprises a thick film resistive track (3, 3A, 3B, 10A, 10B, 12) applied to the surface of an electrically insulative substrate (2). An encapsulating insulating layer is applied over the track to protect it but an area of the element is left uncovered by the encapsulating layer to define a window (6). A portion (11) of a temperature sensitive control device (7) can then be placed in direct contact with the track (10A, 10B, 12) and/or the electrically insulative substrate (2) through the window (6). When used in a heating apparatus comprising a vessel defining a chamber for heating liquid, the window (6) in the element (1) is located in that area of the element (1) which will be uncovered by the liquid prior to the rest of the element (1) as the liquid boils away or is evacuated from the vessel.

Résistance (1) chauffante à couche épaisse comprenant une piste (3, 3A, 3B, 10A, 10B, 12) résistive à couche épaisse appliquée sur la surface d'un substrat (2) isolant électriquement. On enrobe cette piste d'une couche isolante afin de la protéger, mais on laisse à nu une zone de cette résistance afin de délimiter une fenêtre (6). On peut ensuite placer, à travers cette fenêtre (6) et directement en contact avec la piste (10A, 10B, 12) et/ou le substrat (2) isolant, une portion (11) d'un dispositif (7) de commande thermosensible. Lorsque, dans un appareil chauffant comprenant un récipient délimitant une chambre de chauffage de liquide, on utilise la fenêtre (6), on place celle-ci dans la zone de la résistance (1) qui va être découverte par le liquide avant le reste de la résistance (1), lorsque le liquide s'éloigne de celle-ci en bouillant ou lorsqu'on l'évacue du récipient.

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